Problem: whitespace style too restrictive.

For header only library like cppzmq, whitespace style inherited from
libzmq is too restrictive.

Solution: relaxing whitespace before parens from always to in control
statements only, increased max column width from 80 to 85 and removing
requirement of whitespace after template keyword.

.clang-format

@@ -26,14 +26,14 @@ AllowShortBlocksOnASingleLine: false
 AllowAllParametersOfDeclarationOnNextLine: true
 AllowShortFunctionsOnASingleLine: InlineOnly
 AlwaysBreakTemplateDeclarations: false
-ColumnLimit: 80
+ColumnLimit: 85
 MaxEmptyLinesToKeep: 2
 KeepEmptyLinesAtTheStartOfBlocks: false
 ContinuationIndentWidth: 2
 PointerAlignment: Right
 ReflowComments: false
 SpaceBeforeAssignmentOperators: true
-SpaceBeforeParens: Always
+SpaceBeforeParens: ControlStatements
 SpaceInEmptyParentheses: false
 SpacesInAngles: false
 SpacesInParentheses: false
@@ -44,7 +44,7 @@ SortIncludes: false
 
 FixNamespaceComments: false
 BreakBeforeBinaryOperators: NonAssignment
-SpaceAfterTemplateKeyword: true
+SpaceAfterTemplateKeyword: false
 AlignAfterOpenBracket: Align
 AlignOperands: true
 BreakConstructorInitializers: AfterColon

demo/main.cpp

@@ -1,6 +1,6 @@
 #include <zmq.hpp>
 
-int main (int argc, char **argv)
+int main(int argc, char **argv)
 {
     zmq::context_t context;
     return 0;